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ASAHI KASEI
[AKD4589-B]
<KM076201>
2005/07
-
7
-
PORT4
BUCV
1
2
9
10
UOUT
VOUT
VIN
GND
GND
GND
GND
GND
BOUT
COUT
B, U, C, V output and V input
B, U, C, V output and V input is used PORT4 (BUCV).
PORT4 pin order is showed Figure 6.
Figure 6. PORT4 pin order
Analog Inputs
BNC connector J10 (LIN),J9 (RIN) are used for analog inputs on the AKD4589-B. Analog inputs are single-ended
and input ranges of each channels are nominally 6.2Vpp@5V. (Input ranges of each channels of analog inputs of
AK4589 device are nominally [email protected],for the resister division,the value which analog input level of
Evaluation Board is devided by two becomes to analog input level of AK4589 device on the AKD4589-B. So, input
ranges of AKD4589-B becomes to 6.2Vpp@5V,twice of the value in the case of AK4589 device. Input range of
AK4589 device is proportional to VREFH (3.1=0.62 x VREFH). VREFH is connected to AVDD on the
AKD4589-B.)
Analog Input Circuit
AK4589
Signal
22u
33
RIN
Same circuit
3.1Vpp
NJM4580
-
+
Op-amp circuit
32
LIN
6.2Vpp
330
330
Figure 7. Analog Input Circuit
1) Gain
Gain of analog input circuit is
330/(330+330) = -6.02dB.
Therefore input level for this board is
+0.80dBV(=3.1Vpp)+6.02dB
= +6.82dBV = 6.20Vpp = 2.19Vrms.
2) S/N of op-amp circuit (Theory: BW=20k+A)
Non-inverting amp is implemented on board. The output noise level of op-amp circuit is
-126.01dBV
=
-132.54dB
(0dB=+6.53dBV).
S/N of ADC is
101.6dB (measurement).
Therefore total S/N of op-amp circuit and ADC is
101.60dB
(measurement: 101.6dB)